Figure 7
From: Heart energy signature spectrogram for cardiovascular diagnosis
(A,B,C). STFT Heart Sound Resolution (same heart sound that is shown in Figs. 3(A-E)). A) STFT, time window w = 16, frequencies are overstretched, time resolution is good. B) STFT, time window w = 256, frequencies are crude, time resolution is compromised (no split), image is pixilated. C) STFT, time window w = 1024, frequency resolution is good, time resolution is completely compromised, image is pixilated.